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Screening for Down syndrome using first-trimester combined screening followed by second-trimester ultrasound examination in an unselected population

Down SyndromeFamily MedicineEarly DiagnosisPrenatal Genetic TestingDiagnosisGynecologyMaternal HealthPediatricsUnselected PopulationObstetricsPrenatal DiagnosisSecond-trimester Ultrasound ExaminationPrenatal ScreeningPublic HealthMedicinePrenatal Testing